Recent moves by Eugen Rochko (known as Gargron on fedi), the CEO of Mastodon-the-non-profit and lead developer of Mastodon-the-software, got some people worried about the outsized influence Mastodon (the software project and the non-profit) has on the rest of the Fediverse.
Good. We should be worried.
Mastodon-the-software is used by far by the most people on fedi. The biggest instance, mastodon.social, is home to over 200.000 active accounts as of this writing. This is roughly 1/10th of the whole Fediverse, on a single instance. Worse, Mastodon-the-software is often identified as the whole social network, obscuring the fact that Fediverse is a much broader system comprised of a much more diverse software.